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조현만(Hyun-Man Cho),김서현(Seo-Hyun Kim),류연선(Yeon-Sun Ryu),김정태(Jung-Tae Kim) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
This study presents the results of collision analyses of burial cable protector under anchor collision. For the analyses, burial environment such as collision distance, the type of soils and burial depth was estimated. Dynamic finite element program, ANSYS WB Explicit STR was used to collision analyses of burial cable protector. This study focuses on two parameters that are considered two of the fundamental items for the design: the type of soils and burial depth. The purpose of this work is to present fundamental design criteria of burial cable protector.
1차원 충돌 동역학 모델을 이용한 한국형 고속전철의 충돌안전도 평가
조현직(Cho Hyun-Jik),구정서(Koo Jeong Seo),윤영한(Youn Young Han) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, the crashworthiness of KHST is evaluated by analysing a nonlinear spring/bar-damper-mass model using 1 dimensional collision dynamics. The numerical results show that KHST can easily absorb kinetic energy at lower impact force and acceleration in heavy collisions, when compared with KTX. Also, in a light collision like a traint-to-train accident at speed under 8 kph, the carbody and components of KHST can be protected without any damage except a energy absorbing tube to be replaced easily. However, KTX may be much damaged in the light collision because there is no energy absorbing tube. In conclusion, the crashworthy performance of KHST has been much improved than that of KTX, although there remains something to be improved for a better performance.
조현서 ( Hyun Seo Cho ),이수동 ( Soo Dong Lee ),김미정 ( Mi Jeong Kim ) 한국환경생태학회 2012 한국환경생태학회지 Vol.26 No.5
낙동정맥 절구골의 식생구조를 파악하고자 계곡부 약 3km 구간을 대상으로 10m×10m(100㎡) 조사구 29개소를 설치하여 식물군집구조 조사를 실시하였다. TWINSPAN classification에 의한 군락 분류 결과 소나무군락, 낙엽활엽수군락, 굴참나무군락, 신갈나무군락, 일본잎갈나무군락 5개 유형으로 분류되었다. 계곡부와 북사면에는 습윤지성 낙엽활엽수와 참나무류가 주로 분포하였고 일본잎갈나무군락은 당분간 현상태를 유지하겠으나 하층의 들메나무, 산뽕나무, 고로쇠나무 등 낙엽성 활엽수의 세력이 우세해지고 있어 장차 이들 종으로의 천이가 기대되었다. 군락별 종다양도지수는 0.9665~1.2450 범위로 낙동정맥 타 지역에 비해 높은 것으로 나타났다. In order to verify the characteristics of vegetation structure in Jeolgu valley, Nakdongjeongmaek, we set up 29 plots(each plot area is 10m×10m(100㎡)). The survey site is located in around the valley and its range is about 3km section. The forest vegetation communities were analysed by TWINSPAN classification. The results of communities were classified 5 types such as Pinus densiflora community, deciduous broad-leaved tree community, Quercus variabilis community, Quercus mongolica community, Larix leptolepis community. The deciduous broad-leaved tree which prefer to moist environment and Quercus spp. has dominant in around the valley and the northern slope, In addition, Larix leptolepis community expect to maintain the present status for a while. However, the under story of Larix leptolepis community have expanded the influence of deciduous broad-leaved tree such as Fraxinus mandshurica, Morus bombycis, Acer mono and so on. Therefore, there will be developed next ecological succession by species of deciduous broad-leaved tree. The diversity index showed form 0.9665 to 1.2450. It were analyzed that diversity index of Jeolgu valley was higher than other places in Nakdongjeongmaek.
우리나라 연안의 해수 중 유기주석화합물 오염에 관한 연구
조현서(Hyeon Seo Cho),장성원(Sung Won Jang),최민호(Min Ho Choi),박정채(Jeong Chae Park),박정준(Jung Jun Park),신현출(Hyun Chool Shin),임경훈(Kyeong Hun Lim),곽인실(Inn Sil Kwak),정선애(Sun Ae Jeong),이정식(Jung Sick Lee) 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.15 No.2
Organotin compounds are one of the most widely used antifouling agent to prevent adherence of sedentary organisms to ship hull and other structural surfaces immersed in seawater. Major source of organotin compounds released to marine environment is via uses as antifouling paints for ships and cultivating nets. Organotin, in particular tributyltin(TBT) and triphenyltin( TPT) are considered to be dangerous chemicals because of their deleterious effects on non-target marine organisms. Since their adverse effects on oyster farmings near marina were revealed, a series of studies have demonstrated that organotin compounds are highly toxic towards marine organisms. In this study, the concentrations of six organotin compounds, such as TBT, TPT and their motabolites, in seawater collected at the coast were determined. Seawater were collected at several sites on the coastal area of Korea. The dibutyltin(DBT) and tributyltin compounds were detected in almost seawater samples analyzed. DBT was higher than other organotin species in the mean concentration of 14.35 ( ng/L) in seawater. The contamination levels of butyltin compounds in coastal seawater were highly detected around harbour of South and East coast than West coast. The results indicated substantial contamination along the coast of Korea in which the butyltin levels were comparable to those reported from other oversea coastal areas.
오미자약침액(五味子藥鍼液)의 NO, DPPH 소거(消去) 및 IL-4에 대한 억제효과(抑制效果)
조현열,윤종석,서보명,이세연,김성웅,백정한,박치상,서정철,한상원,Cho Hyun-Yeul,Yoon Jong-Seok,Seo Bo-Myung,Lee Sea-Youn,Kim Sung-Woong,Baek Jung-Han,Park Chi-Sang,Seo Jeong-Chul,Han Sang-Won 경락경혈학회 2003 Korean Journal of Acupuncture Vol.20 No.1
Backgrounds : It has been investigated about ageing theory. However, ageing mechanism still remains to be unknown. Since Harman proposes that ageing and ageing related diseases might be due to oxidative damage and these are modifiable by genetic and environmental factors. For designing an optimal nutritional countermeasure against ageing and ageing related disease, it is necessary to understand the ageing mechanism and other reactive species. Objectives : Schizandra Chinesis has been clinically used to treat brain disease, respiratory or inflammatory disease etc. in Oriental medicine. The purpose of this study is to investigate the scavenging effect of Schizandrae Fructus herbal-acupuncture solution(SFHA) on NO, DPPH and IL-4. Results : The results are summarized as follows; (1) There is a significant scavenging effect of SFHA on NO in 0.1, 1, 10mg/ml group after 24hrs. (2) There is a significant scavenging effect of SFHA on DPPH in 1, $10{\mu}g/ml$ group. (3) There is a significant inhibitory effect of SFHA on IL-4 in 1, 10, $100{\mu}g/ml$ group. Conclusions : These findings indicate that SFHA can be used as antioxidant or antiimflammatory drug. But further study is needed about the effect of SFHA.
국내 철도차량안전법 요구 압괴 성능의 대형장애물 수치모델 개발
조현직(Cho Hyun-Jik),구정서(Koo Jeong-Seo),이장욱(Lee Jang-Wook),박경창(Park Kyoung-Chang),박근수(Park Geun-Soo) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
This study aims to develope a numerical model of the huge obstacle defined in the Korean Rollingstock Safety Regulations. The shape and mechanical properties to be satisfied in the numerical model were based on the Regulations. Through a troublesome trial and error simulations, we developed the numerical model of the huge obstacle to satisfy physical properties of the specified guideline in the regulations. By applying the developed numerical obstacle, we carried out a crash simulation to evaluate vehicle crashworthiness.